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Properties

Melting point:: -42 °C (lit.)

Boiling point:: 115 °C (lit.)

Density: 0.978 g/mL at 25 °C (lit.)

vapor density: 2.72 (vs air)

vapor pressure: 23.8 mm Hg ( 25 °C)

FEMA: 2966 | PYRIDINE

refractive index: n20/D 1.509(lit.)

Flash point:: 68 °F

storage temp.: Store at +5°C to +30°C.

solubility: H2O: in accordance

form: Liquid

pka: 5.25(at 25℃)

color: colorless

Odor: Nauseating odor detectable at 0.23 to 1.9 ppm (mean = 0.66 ppm)

Relative polarity: 0.302

PH: 8.81 (H2O, 20℃)

explosive limit: 12.4%

Odor Threshold: 0.063ppm

Odor Type: fishy

biological source: synthetic

Water Solubility: Miscible

FreezingPoint: -42℃

Specific Heat Capacity: Cp(liquid): 1.68 J/(g·K), at 25℃

Thermal Conductivity: 0.162 W/(m·K) at 25 ℃

λmax: λ: 305 nm Amax: 1.00
λ: 315 nm Amax: 0.15
λ: 335 nm Amax: 0.02
λ: 350-400 nm Amax: 0.01

Merck: 14,7970

BRN: 103233

Henry's Law Constant: 18.4 at 30 °C (headspace-GC, Chaintreau et al., 1995)

Dielectric constant: 12.5（20℃）

Exposure limits: ACGIH:TLV-TWA 1 ppm (3.1 mg/m3)
OSHA:PEL-TWA 5 ppm (15 mg/m3)
NIOSH:REL-TWA 5 ppm

Stability:: Stable. Flammable. Incompatible with strong oxidizing agents, strong acids.

InChI: 1S/C5H5N/c1-2-4-6-5-3-1/h1-5H

InChIKey: JUJWROOIHBZHMG-UHFFFAOYSA-N

SMILES: C1=CN=CC=C1

LogP: 0.64 at 20℃

Surface tension: 38mN/m at 20°C

CAS DataBase Reference: 110-86-1(CAS DataBase Reference)

IARC: 2B (Vol. 77, 119) 2019

NIST Chemistry Reference: Pyridine(110-86-1)

EPA Substance Registry System: Pyridine (110-86-1)

Safety Information

Symbol(GHS): GHS02,GHS05,GHS07,GHS08,GHS09

Signal word: Danger

Hazard statements: H302+H312+H332-H314-H361-H370-H372-H351-H335-H304-H410-H225

Precautionary statements: P501-P273-P270-P202-P240-P260-P210-P233-P201-P243-P241-P242-P271-P264-P280-P370+P378-P391-P308+P311-P362+P364-P303+P361+P353-P301+P310-P301+P330+P331-P304+P340+P310-P305+P351+P338+P310-P403+P233-P403+P235-P405

Hazard Codes: T,N,F,Xn

Risk Statements: 11-20/21/22-39/23/24/25-23/24/25-52-36/38

Safety Statements: 36/37/39-38-45-61-28A-26-28-24/25-22-36/37-16-7

OEB: A

OEL: TWA: 5 ppm (15 mg/m3)

RIDADR: UN 1282

WGK Germany: 2

RTECS: UR8400000

F: 3-10

Autoignition Temperature: 482 °C

Hazard Note: Highly Flammable/Harmful

TSCA: TSCA listed

HS Code: 2933 31 00

HazardClass: 3

PackingGroup: II

Storage Class: 3 - Flammable liquids

Hazard Classifications: Acute Tox. 4 Dermal
Acute Tox. 4 Inhalation
Acute Tox. 4 Oral
Eye Irrit. 2
Flam. Liq. 2
Skin Irrit. 2

Hazardous Substances Data: 110-86-1(Hazardous Substances Data)

Toxicity: LD50 orally in rats: 1.58 g/kg (Smyth)

IDLA: 1,000 ppm

REACH Registrations: Active

Limited Quantities: 1.0 L (0.3 gallon) (liquid)

Excepted Quantities: Max Inner Pack (30g or 30ml) and Max Outer Pack (500g or 500ml)

Use

Pyridine (Formula is C6H5N) is a six-membered heterocyclic compound containing one nitrogen heteroatom. It is structurally related to benzene, with one methine group (=CH-) replaced by a nitrogen atom. Just like benzene, Pyridine has same electronic structure, and it is still aromatic, so it is also known as nitrogen benzene and azobenzene. Pyridine is a colorless liquid with special odor at room temperature, and melting point is -41.6 ℃, and boiling point is 115.2 ℃. It will form azeotropic mixture with water, and boiling point of the mixture is 92 ~ 93 ℃(The property is used to purify pyridine in industry.) Its density is 0.9819g / cm3. Pyridine is soluble in water, ethanol, ether and other organic solvents, and itself can also be used as solvent. Pyridine was discovered in 1849 by the Scottish chemist Thomas Anderson as one of the constituents of bone oil. Two years later, Anderson isolated pure pyridine through fractional distillation of the oil.